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The long rail is actually an antenna. It is used for the EAS system. EAS is the french short for Equipement à Agent Seul, which means "sole-agent equipment". The antenna is used to transmit the video feeds of the platorm's cameras to screens inside the driving cab. The driver is able to remotely close or open the doors while watching for any incident, ...


The tube or subway is called the Underground. A typical direction sign within a terminal at Heathrow is shown below. The London Underground logo is used everywhere in the signage.


There are three stations: Heathrow Terminals 2&3 Heathrow Terminal 4 Heathrow Terminal 5 (Note that 2, 3, 4 and 5 are the only terminals: Terminal 1 closed a few years ago.) The station for Terminals 2 and 3 is between the two terminals and is reached by clearly signposted pedestrian tunnels. The stations for 4 and 5 are in the ...


The short one is a so-called crocodile, a piece of safety equipment that transmits signals to the driver. I'm not sure about the long one.

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